14-07-2021, 03:50 PM
No such thing as a silly question Mike.
The inlet ports are 'siamesed' i.e. they blend into one, so counting the valves from the front 1st is #1 exhaust, 2nd is #1 inlet; 3rd is #2 inlet, which shares the same port as #1, followed by #2 exhaust; then the pattern is repeated.
The inlet ports are 'siamesed' i.e. they blend into one, so counting the valves from the front 1st is #1 exhaust, 2nd is #1 inlet; 3rd is #2 inlet, which shares the same port as #1, followed by #2 exhaust; then the pattern is repeated.